hi im having trouble keeping my cdrom drive to keep the permissions of read and write for world/other. Are changes made with chmod permanent? The permissions change when grip freezes up and i have to reboot by shutting off the power, so i imagine that is why they don't stay but it is frustrating to have to always change the mode everytime so that grip can read and write using the drive.

There are two systems of setting up devices for Linux currently: devfs (which is to be phased out) and udev. I don't know if Fedora Core uses devfs or the replacement udev, but I would wager on the latter if I had to, so read up on how to set up udev properly (man udev should be a good start).


Håkan

If I remember correctly changes to permissions on mountpoints needs to be done in your /etc/fstab .

This is my line for the cdrom in /etc/fstab:
/dev/cdroms/cdrom0 /mnt/cdrom auto noauto,users 0 0

Its the noauto,users part that is interesting for permissions.

Hope this helps.

/Sinner

Three, actually ... funny you should only mention
the ones that DO forget perms.

There's also the good old static device-nodes a la 2.4
of course ... in which case the perms would be permanent.

Nuh, that doesn't change the permissions, only says whether
the user is allowed to run the mount or not. The perms on
mount-points as such are still set using chmod.



Cheers,
Tink

I stand corrected Tinkster....
After a bit of research though i found that permissions can be set in fstab using umask, for example:
will set the permissions to on the mountpoint to 755 ,with the user and group being those of the user that mounted the drive.
umask=000 would be 777, so it starts from allowing everything and then deselects permissions.

The modes are as follows (the first column is the mode octal number):

Quote:

M | R W X
--------------------
0 | * * *
1 | * * -
2 | * - *
3 | * - -
4 | - * *
5 | - - *
6 | - * -
7 | - - -

/Sinner

p.s
I know this applies to harddrives and I do not think cdroms are any different

Edit:
info snipped from:

http://forums.gentoo.org/viewtopic-t...untpoints.html
http://forums.gentoo.org/viewtopic.php?t=29285

Let me correct you again:

It *doesn't* modify the permissions of the mount-point.
It changes the perms for the stuff that's being mounted
there. Once you unmount the perms on the mountpoint
will be the same they were before you mounted anything.



Cheers,
Tink

to change the permissions of my cd rom drive would i change the entry in 50-udev.permissions or would i make a new file starting with a number less then 50 specifically for my cdrom? something like 10-cdrom.permissions? I've changed the permissions in 50-udev.permissions for my cdrom but it results in less permssions then if i hadn't changed it. i changed it from 0660 to 0666. thanks for any replies in advance.